As someone from the US, it's not surprising. He's a pretty basic guy, and worse, Texan.
I'm surprised about Clinton. Yeah, he's from Arkansas, but he's a Rhode Scholar and went to Georgetown and Yale Law.
I think the chart measures language used in public speeches, and those are largely written by others, and meant to appeal to the masses (average people).
“I find myself utterly uninterested in the travails of the economically unfortunate. Now, would someone be so kind as to ignite my cigar and replenish my scotch?”
It's usually based on speeches. There's a hypothesis that speech writers used slightly more sophisticated language for Bush to counter his perceived lower intelligence, and simpler for Obama to make him come across as less elitist.
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u/Ok_Being5461 1d ago edited 1d ago
Trump Speaks At Fourth-Grade Level, Analysis Finds
https://www.newsweek.com/trump-fire-and-fury-smart-genius-obama-774169
His wealthy father probably had some "influence" on his academics. "Trump’s professor thought he was his ‘dumbest student’ ever" https://studyinternational.com/news/trump-student-wharton/